From Cold bay in the middle of the Aleutian Peninsula to Sondrestrom on the West Coast of Greenland is 3311 Statute miles, Great Circle.
A migration like that must have taken centuries......
I forget the explorer’s name, but a Brit logged over 5000 miles by dog sled and canoe in one year back in the 1700s. Amazing, huh? Oh yeah, he was sent by the Hudson Bay Company to find the Copper River, which he did.
Hmmm, I wonder what the climate was like 4,500 years ago? I’ll bet a bit warmer than now.